Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2007-05-22
2007-05-22
Cherry, Euncha P. (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C369S112230
Reexamination Certificate
active
10523384
ABSTRACT:
An optical scanning device (1) for scanning an information layer (4) of an optical record carrier (2), the device (1) comprising a radiation source (11) for generating a radiation beam (12, 15, 20) and an objective system (18) for converging the radiation beam on the information layer, the information layer being covered by a transparent layer (3) of thickness td and refractive index nd. The objective system comprises a lens having a protection device projecting away from the lens towards the optical record carrier such that the distance between the protection device and the optical record carrier is less than the free working distance. The lens satisfies the condition: where D is the entrance pupil diameter, FWD is the free working distance, and D, FWD, t and td are all expressed in millimeters and where FWD+td
d<0.51.
REFERENCES:
patent: 6930973 (2005-08-01), Hendriks et al.
patent: 1081692 (2001-03-01), None
patent: 1081692 (2002-12-01), None
M. Itonga, et.al. Single Objective Lens Having Numerical Aperture of 0.85 for a High Density Optical Disk System; Mar. 2002; vol. 41 pp. 1798-1803; part 1; No. 3B.
Hendriks Bernardus Hendrikus Wilhelmus
Mori Nobuyoshi
Schleipen Johannes Joseph Hubertina Barbara
Van As Marco Andreas Jacobus
Yagi Katsuya
Cherry Euncha P.
Koninklijke Philips Electronics N. V.
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